CB/PP复合材料的导电性能和PTC效应研究  

Conductivity and PTC Phenomenon of CB/PP Composites

作　　者：钟志有[1] 杨玲玲[1] 周金[1] 李慧[2] 

机构地区：[1]中南民族大学电子信息工程学院,武汉430074 [2]湖北工业大学化学与环境工程学院,武汉430068

出　　处：《中南民族大学学报（自然科学版）》2010年第2期31-34,共4页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：湖北省自然科学基金资助项目(2009CDB166)

摘　　要：采用碳黑(CB)Vulcan XC-72为填充材料、聚丙烯(PP)为基体材料制备了CB/PP导电复合材料,研究了CB含量对CB/PP复合体系导电性能和电阻正温度效应(PTC)的影响.结果表明:复合体系的电阻率随着CB含量的增加呈非线性的递减,当CB含量增大到2.5 wt%时,发生绝缘体—导体转变;同时复合体系的电阻率随温度的升高而增大,当温度达到167℃左右时发生突变,表现出PTC特性;并且CB含量越大,则复合体系的PTC强度越小.The conductivity and positive temperature coefficient （PTC） characteristic of carbon black （CB） filled polypropylene （PP） composites （CB/PP） were investigated. The results indicate that the resistivity of Vulcan XC- 72/PP composite decreases nonlinearly with the increase of the CB content. When the CB content is up to 2. 5 wt%, a drastic transition from an electrical insulator to a conductor is observed. The resistivity of the composite increases with the increment of temperature, when the temperature reaches about 167 ℃, a drastic transition from a conductor to an electrical insulator is exhibited, showing obvious PTC characteristics. The PTC intensity of the composites with high CB content is lower than that of the composites with low CB content.

关 键 词：导电复合材料 碳黑/聚丙烯 正温度系数(PTC) 

分 类 号：TB332[一般工业技术—材料科学与工程]